JP2021183413A - Ball point pen - Google Patents

Abstract

To provide a ball point pen which enables writing with a fine line width or a thick line width according to user's preferences and enables writing with a stable line width regardless of a writing angle.SOLUTION: A ball point pen includes: a barrel; a chip holder housed within the barrel; a chip which is attached to the chip holder in such a way so as to be movable forward and rearward; a ball held at a front end of the chip; an ink storage part cylinder which is disposed rearward of the chip and stores an ink; an outer cylindrical body which may move in an axial direction relative to the chip holder and tilt in the axial direction of the chip; a first bouncing member which bounces the outer cylindrical body forward when the outer cylindrical body is moved rearward relative to the chip holder; and a second bouncing member which is disposed rearward of the chip and bounces the chip forward. The ball forms a frist writing part and a second writing part is formed at a front end of the outer cylindrical body.SELECTED DRAWING: Figure 3

Description

The present invention relates to a ballpoint pen, and more particularly to a ballpoint pen capable of writing with two writing units.

Patent Document 1 discloses a ballpoint pen capable of changing the line width as desired.

Specifically, as shown in FIGS. 7 and 8, in the ballpoint pen disclosed in Patent Document 1, an outer that slides and moves in the axial direction with respect to the holder 121 to the outside of the holder 121 that holds the ball 130. 150 (cylinder body) is provided. Then, as shown in FIG. 8, when the writing pressure is strong, the holder 121 is immersed in the outer 150, and when the ball 130 and the tip portion 151 of the outer 150 come into contact with the writing surface at the same time, The ink adhering to the surface of the ball 130 diffuses to the writing surface P due to the capillary phenomenon and adheres to the tip portion 151 of the outer 150, and the ink adheres to the ball 130, the writing surface, the tip portion 151 of the outer 150, and the tip portion of the holder 121. Ink stays in the space surrounded by 123 (caulking portion).

When writing in such a state, ink is continuously supplied to the space as the ball 130 rotates, and the tip portion 151 of the outer 150 and the writing surface are formed from the contact portion between the ball 130 and the writing surface. A line with a line width w2 up to the contact portion of is drawn. Since this line width w2 is larger (thicker) than the line width w1 (see FIG. 7) when the writing pressure is weak, the user of the ballpoint pen can use two types of line widths according to the writing pressure. Is.

Patent No. 5940899

However, in the structure of Patent Document 1, the line width at the time of writing can be changed by the writing pressure, but when the writing angle of the ballpoint pen with respect to the writing surface changes during writing, the position of the outer 150 in contact with the writing surface changes. do. Therefore, the closer the writing angle of the ballpoint pen is to the writing surface, the smaller the line width w2 becomes due to the center of the contact position with the writing surface of the outer 150, and the closer the ballpoint pen tilts to the writing surface, the smaller the writing of the outer 150. Since the surface and the contact position are separated from the center, the line width w2 becomes large. That is, there is a risk that the line width w2 will vary due to a change in the writing angle.

The inventor of the present invention has repeatedly made various prototypes and evaluations based on diligent studies, and it is effective to configure the outer cylinder so that it can be tilted with respect to the holder in order to stabilize the line width at the time of writing. Was found.

The present invention has been made based on the above background, and an object thereof is to be able to properly use writing with a thin line width and a thick line width, and to have a stable line width regardless of the writing angle. It is to provide a ballpoint pen capable of writing.

The present invention is held at a tip holder housed inside the barrel, a tip arranged in front of the tip holder and movably mounted back and forth with respect to the tip holder, and a front end of the tip. A ball, an ink accommodating cylinder arranged behind the chip and accommodating ink, and at least at the time of writing, arranged outside the chip and movable relative to the chip holder in the axial direction, and of the chip. An outer cylinder that can be tilted in the axial direction and an outer cylinder that is arranged behind the outer cylinder and repels the outer cylinder forward when the outer cylinder retracts with respect to the chip holder during writing. A first firing member and a second firing member arranged behind the chip and repelling the chip forward are provided, and the ball constitutes the first writing portion and is attached to the front end of the outer cylinder. A ball pen in which a second writing portion is formed, and the chip retracts during writing so that the first writing portion and the second writing portion come into contact with the writing surface at the same time.

According to the present invention, the tip is mounted so as to be movable back and forth with respect to the tip holder, and the tip is urged forward by the second firing member. By writing with a weak writing pressure, it is possible to write with a thin line width drawn only by the first writing part. Further, the outer cylinder arranged on the outside of the chip is movable relative to the axial direction of the chip, while the tip portion has a second writing portion that abuts on the writing surface. As a result, at the time of writing, when the writing pressure exceeds the elastic force of the second firing member, the tip retracts and the second writing portion of the outer cylinder abuts on the writing surface. At this time, the ink supplied to the writing surface by the ball held at the front end of the chip, which is the first writing part, can be stretched by the second writing part of the outer cylinder, so that writing with a thick line width is possible. Is. Further, according to the present invention, when the outer cylinder body is moved backward by the first elastic member, the outer cylinder body is repelled forward and the outer cylinder body can be tilted in the axial direction of the chip. Since the outer cylinder can sometimes tilt along the writing surface when it comes into contact with the writing surface, the ink can be stably stretched at the writing portion. Therefore, the line width is less likely to vary, and writing with a constant thickness can be continued.

It is preferable that the second writing portion of the outer cylinder is tilted along the writing surface at the time of writing and comes into surface contact with the writing surface. In this case, the entire surface of the second writing portion comes into contact with the writing surface. Therefore, it is possible to write with a more stable line width.

The first firing member is preferably formed of a coil spring, and in this case, the outer cylinder body slides smoothly with respect to the chip according to the writing surface and the writing angle, so that the writing feeling is improved.

The outer cylinder body may be integrally formed on the front portion of the first firing member, and in this case, the manufacturing cost can be reduced because the assembly step is not required. Further, when a coil spring is used for the first firing member, a close contact portion may be formed on the front portion of the coil spring to form an outer cylinder. In this case, the first firing member and the outer cylinder are connected to each other. Since it is not necessary, the outer cylinder can be formed with a small diameter, and the tip of the refill can be easily visually recognized when writing, which improves writing performance.

According to the present invention, by configuring the outer cylinder body so as to be tiltable with respect to the chip, it is possible to provide a ballpoint pen capable of writing with a stable line width regardless of the writing angle.

It is a vertical sectional view of the ballpoint pen in one Embodiment of this invention. It is a vertical sectional view which shows the state which the refill of the ballpoint pen of FIG. 1 has advanced. It is a vertical sectional view which shows the front part of the ballpoint pen of FIG. FIG. 2 is a vertical cross-sectional view showing a front portion of FIG. 2 in a state where the ball (first writing portion) is in contact with the writing surface in the state of FIG. 2. FIG. 3 is a vertical cross-sectional view showing a state in which the writing pressure is increased from the state of FIG. 4 and the end portion of the front end (second writing portion) of the outer cylinder is in contact with the writing surface. FIG. 5 is a vertical cross-sectional view showing a state in which the writing pressure is further increased from the state of FIG. 5 and the entire front end (second writing portion) of the outer cylinder is in contact with the writing surface. It is a vertical cross-sectional view which shows the front end part of the ballpoint pen of Patent Document 1 when writing with a relatively weak writing pressure (the figure corresponding to FIG. 5 of Patent Document 1). It is a vertical cross-sectional view which shows the front end part of the ballpoint pen of Patent Document 1 when writing with a relatively strong writing pressure (the figure corresponding to FIG. 6 of Patent Document 1).

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First Embodiment)
1 is a vertical cross-sectional view of the ballpoint pen 1 according to the first embodiment of the present invention, FIG. 2 is a vertical cross-sectional view showing a state in which the refill 3 of the ballpoint pen 1 of FIG. 1 is advanced, and FIG. 3 is a vertical cross-sectional view. It is a vertical sectional view which shows the front part of the ballpoint pen 1 of FIG.

The ballpoint pen 1 of the present embodiment shown in FIG. 1 is a retractable ballpoint pen, and includes a shaft cylinder 2 having a front opening at the front end. Inside the barrel 2, a refill 3 that can move in the axial direction of the barrel 2 is housed. As shown in FIG. 1, the refill 3 has an ink storage cylinder 4 on the rear side, and a chip holder 10 is fixed to the front end of the ink storage cylinder 4. The tip 30 is inserted into the tip holder 10 so as to be movable back and forth, and can appear and disappear from the front opening of the barrel 2 as the refill 3 moves. A first coil spring 60 is mounted on the tip holder 10.

The appearance mechanism (not shown) of the present embodiment is a rear end knock type appearance mechanism using a rotary cam mechanism. The haunting mechanism includes a cam portion formed on the inner surface of the rear portion of the barrel 2, a rotating member that engages with the cam portion and abuts on the rear end of the refill 3, and a rotating member that engages with the rotating member and the barrel 2. It is composed of an operation unit 5 protruding from the rear opening, and a coil spring 8 (for example, a compression coil spring) housed in the barrel 2 and urging the refill 3 rearward.

Further, the infestation mechanism of the present embodiment is a double knock type in which both the pen tip protrusion operation and the pen tip immersion operation press the operation unit 5 forward. Specifically, when the operating body 5 is pressed forward while the refill 3 is immersed in the barrel 2, the refill 3 is moved to the front side and connected to the front portion of the tip holder 10. The tip 30 is in the state shown in FIG. 2 in which the tip 30 protrudes from the front opening of the barrel 2. Then, the protruding state is maintained by the locking action between the cam portion (not shown) and the rotating member. When the operating body 5 is pressed forward while the tip 30 is protruding (the state shown in FIG. 2), the locked state between the cam portion and the rotating member is released. As a result, the refill 3 is returned to the rear side by the action of the coil spring 8, and the tip 30 retracts from the front opening of the barrel 2.

Subsequently, as shown in FIG. 3, the chip 30 is composed of a tubular chip main body 31, an intermediate cylinder 32, and an O-ring 33. The intermediate cylinder 32 is non-detachably press-fitted to the rear portion of the chip main body 31, and the O-ring 33 is attached to a groove formed in the outer peripheral portion of the intermediate cylinder 32 to form a gap between the intermediate cylinder 32 and the chip holder 10. It is an airtight sealing member. The O-ring is made of, for example, silicon rubber.

Further, the chip 30 has an inner cylinder reduced diameter portion capable of annularly contacting a part of the front side of the ball 40 at the front end portion of the chip main body 31. As a result, the chip 30 functions as a holder for holding the ball 40. The size and shape of the inner cylinder reduced diameter portion are selected according to the size of the ball 40. In the present embodiment, since the diameter of the ball 40 is 1.00 mm, the inner diameter of the tip of the inner cylinder reduced diameter portion (the narrowest diameter). ) Is 0.940 mm. Then, a first writing portion 50 is formed in which the ink in the ink accommodating cylinder 4 is discharged to the writing surface via the ball 40 at the time of writing.

Further, a core 71 that abuts on a part of the rear side of the ball 40 extends along the axial center of the chip 30 and is coupled to the front end of the third coil spring 70. The rear end of the third coil spring 70 is supported by the intermediate cylinder 32, and the third coil spring 70 urges the ball 40 to the front side with respect to the tip holder 10 via the core 71. The third coil spring 70 has, for example, a wire diameter of φ0.14 mm, a coil average diameter of 1.0 mm, and a coil length of 9 mm. The core 71 has, for example, a diameter of φ0.14 mm and a length of 3.5 mm, and the material of the third coil spring 70 and the core 71 is, for example, stainless steel.

The tip 30 is mounted in the inner hole portion 10b of the tip holder 10, and the outer peripheral portion of the intermediate cylinder 32 rides over and fits the inner protrusion 10c formed in the inner hole portion 10b at the time of mounting. For this reason, the tip 30 is non-detachably mounted on the tip holder 10 and has a gap that slides back and forth, so that the tip 30 is movably mounted within the range of the gap. Further, a second coil spring 80 (an example of a second firing member) is stretched between the rear end portion of the intermediate cylinder 32 (tip 30) and the inner stage portion 10d of the tip holder 10, and the second coil spring. The elastic force of 80 is urging the chip 30 forward. The second coil spring 80 has a diameter of φ0.15 mm and a length of 6.0 mm, and the material thereof is, for example, stainless steel.

On the other hand, a first coil spring 60 (an example of a first elastic member) is press-fitted and fixed to the outer peripheral portion 10a of the tip holder 10, and a close contact functioning as an outer cylinder in the present invention is attached to the front portion of the first coil spring 60. The portion 61 is integrally formed.

The first coil spring 60 is formed by using, for example, a stainless wire having a wire diameter of 0.16 mm and having an average coil diameter of 2.8 mm and a coil length of 14 mm in the central portion. The rear portion of the first coil spring 60 is provided with a rear diameter-expanded portion 60b whose diameter is larger than that of the central portion, and a contact portion 61 (in the present invention) in which a stainless wire is brought into close contact with the front portion and the diameter is reduced toward the front. An example of an outer cylinder) is formed. A gap is provided between the outer peripheral portion of the tip 30 and the inner hole portion of the close contact portion 61. Due to this gap, the close contact portion 61 (outer cylinder body) expands and contracts the spring of the first coil spring 60 to expand and contract the shaft of the tip 30. It can move back and forth along the direction, and the spring bends so that it can tilt with respect to the tip 30. A second writing portion 61b is formed at the front end portion of the first coil spring 60, and when the second writing portion 61b comes into contact with the writing surface P during writing, a part of the first coil spring bends. The contact portion 61 is tilted with respect to the chip 30, and the entire surface of the second writing portion 61b is configured to smoothly abut on the writing surface P.
The second writing portion 61b of the close contact portion 61 (outer cylinder) is preferably configured to be located behind the front end of the chip 30 when not writing. In this case, the writing pressure is the second coil spring 80. As long as the elastic force is not exceeded, writing is possible only in the first writing unit 50, and when the writing pressure exceeds the elastic force of the second rubane 80, the chip 30 retracts with respect to the chip holder 10. 2 Since the writing unit 61b comes into contact with the writing surface, the ink ejected from the first writing unit 50 is stretched by the second writing unit 61b, and the line width is thicker than the line width drawn only by the first writing unit 50. It will be possible.

The ballpoint pen 1 having the above configuration operates as follows.

When the tip of the refill 3 is brought close to the writing surface P by grasping the ballpoint pen 1 in the state of FIG. 3 for writing, as shown in FIG. 4, a part of the ball 40 which is the first writing part 50 is written. It abuts on the surface P. At this time, as long as the writing pressure does not exceed the elastic force of the second coil spring 80, the ballpoint pen 1 can be written only by the first writing portion 50, and only the ball 40 comes into contact with the writing surface P and has a line width X1 (see FIG. 4). Can be written

Next, when the writing pressure is made stronger than the elastic force of the second coil spring 80 from the state of FIG. 4, the second coil spring contracts and the tip 30 retracts. Then, the end of the second writing portion 61b of the close contact portion 61 of the first coil spring 60 comes into contact with the state shown in FIG. When the writing pressure is further increased, the contact portion 61 (outer cylinder body) tilts while retracting with respect to the axial direction of the chip 30 so that the entire surface of the second writing portion 61b abuts on the writing surface P. Become.
When writing is started in the state shown in FIG. 6, first, when the ball 40 receives the writing pressure, the second coil spring 70 resists the urging action and the second coil spring 71 is compressed via the core 71. The ball 40 moves rearward from the state of contact with the inner cylinder reduced diameter portion, and the inner cylinder reduced diameter portion of the chip 30 and the front side of the ball 40 are separated from each other. The ink from the ink supply path formed in the above is supplied to the contact region between the ball 40 (first writing unit 50) and the writing surface P. Then, when the ball 40 moves the writing surface P while rotating by operating the ballpoint pen 1 for writing, the ink supplied to the writing surface P is drawn by the second writing unit 61b in contact with the writing surface P. The writing surface P is stretched, and a handwriting having a line width substantially equal to the outer diameter of the second writing portion 61b (outer diameter of the tip portion of the close contact portion 61) X2 (see FIG. 6) is formed on the writing surface P. At this time, since the outer diameter X2 of the second writing portion 61b that abuts on the writing surface P is larger than the line width X1 (see FIG. 4) drawn only by the ball 40, the writing pressure is increased to make the line width thicker. Can form a handwriting.

Since the close contact portion 61 can be retracted and tilted with respect to the tip 30 by the action of the first coil spring 60, even if the axial angle of the ballpoint pen 1 with respect to the writing surface P changes during writing, the close contact portion 61 ( Since the second writing portion 61b at the tip of the outer cylinder) keeps smooth surface contact with the writing surface P, it is possible to continuously write a handwriting with a stable thickness and improve the writing feeling.
The maximum angle at which the close contact portion 61 can be tilted with respect to the axial direction of the chip 30 is set as the maximum tilt angle S1 of the outer cylinder, and the refill 3 is set up perpendicular to the writing surface P to hold the ball 40 and the second writing portion 61b. When the refill 3 is tilted from the state where it is in contact with the writing surface P, the angle at which the tip of the chip 30 comes into contact with the writing surface P and the ball 40 (first writing unit 50) is separated from the writing surface P is set. When the maximum refill tilt angle S2 is set, it is preferable that S1 ≧ S2. In this case, if the first writing portion 50 always abuts on the writing surface P and the ink is supplied to the writing surface P, the writing tilt angle is sufficient. Since the close contact portion 61 can also be tilted accordingly, the second writing portion 61b can always be brought into surface contact with the writing surface P. Therefore, it is possible to stabilize the line width of the handwriting.

Further, in a general ballpoint pen, it is preferable that the maximum tilt angle of the refill when writing is within 30 ° from the state where the ballpoint pen is erected perpendicular to the writing surface P. However, since the writing angle may vary depending on the user, the angle at which the contact portion 61 can be tilted with respect to the axial direction of the chip 30 is the angle at which the refill 3 is tilted with respect to the writing surface P during writing. Therefore, it is preferable to incline by 30 ° or more, and more preferably to incline by 35 ° or more so that the contact of the second writing unit 61b with the writing surface P is always continued. In this embodiment, the maximum refill tilt angle S2 is specifically set to 35 °, and the maximum tilt angle S1 of the close contact portion 61 is set to 42 °, so that even if the writing angle of the user varies. The second writing portion 61b of the close contact portion 61 always abuts on the writing surface P, so that the line width of the handwriting becomes stable.

Further, in the present embodiment, by changing the writing pressure during writing, the line width X1 at the time of writing in a state where only the ball 40, which is the first writing portion 50 of FIG. 4, is in contact with the writing surface P. From, through the state of FIG. 5 in which a part of the second writing unit 50 abuts on the writing surface P, gradually to the line width X2 in which the entire surface of the second writing unit 61b of FIG. 6 abuts on the writing surface P. You can change the line width of the handwriting. Therefore, by controlling the writing pressure, it is possible to write while freely changing the line width during writing.

In the present embodiment, since the first coil spring 60 (first elastic member) and the close contact portion 61 (outer cylinder body) are integrally formed, it is necessary to provide a fitting portion for connection. It is possible to form the close contact portion 61, which is an outer cylinder, with a small diameter. Therefore, the writing portion 61b can be easily visually recognized at the time of writing, so that the operability is improved. Further, when a part of the first coil spring 60 bends and the close contact portion 61 tilts at the time of writing, the close contact portion 61 itself is a part of the close contact coil spring, so that it can be slightly bent. Therefore, the outer cylinder 61 reacts swiftly and tilts according to the writing angle and the unevenness of the writing surface P, and the contact state of the entire second writing portion 61b with the writing surface P is easily maintained. The line width of the handwriting becomes more stable. Further, although not shown, the first coil spring 60 (first firing member) and the outer cylinder may be formed and fitted separately. In this case, the second writing which is the tip of the outer cylinder may be formed. Since it is easy to form a smooth second writing portion with small irregularities by subjecting the portion to a plating process or the like, friction with the writing surface P can be reduced and the writing property can be improved.

1 Ballpoint pen 2 Shaft cylinder 3 Refill 4 Ink storage cylinder 5 Operation part 8 Coil spring 10 Chip holder 10a Outer peripheral part 10b Inner hole part 10c Inner protrusion 10d Inner stage part 30 Tip 31 Chip body 32 Intermediate cylinder 33 O-ring 40 Ball 50 1st writing Part 60 1st coil spring (1st firing member)
60b Rear diameter expansion part 61 Adhesion part (outer cylinder)
61b 2nd writing department
70 3rd coil spring 71 Core 80 2nd coil spring (2nd firing member)
P Writing surface w1 Line width w2 Line width X1 Line width X2 Line width.

Claims (4)

With the shaft tube
A tip holder housed inside the barrel, a tip placed in front of the tip holder and movably mounted back and forth with respect to the tip holder, a ball held at the front end of the tip, and the above. An ink storage cylinder that is placed behind the chip and stores ink,
An outer cylinder that is arranged outside the chip at least during writing, can move relative to the chip holder in the axial direction, and can tilt in the axial direction of the chip.
A first firing member that is arranged behind the outer cylinder and repels the outer cylinder forward when the outer cylinder retracts with respect to the chip holder at the time of writing.
A second firing member, which is arranged behind the chip and repels the chip forward, is provided.
The ball constitutes the first writing portion, and the second writing portion is formed at the front end of the outer cylinder.
A ballpoint pen characterized in that the first writing portion and the second writing portion come into contact with the writing surface at the same time when the tip is retracted during writing. The ballpoint pen according to claim 1, wherein the second writing portion of the outer cylinder body tilts along the writing surface at the time of writing and comes into surface contact with the writing surface. The ballpoint pen according to claim 1 or 2, wherein the first firing member is a coil spring. The ballpoint pen according to any one of claims 1 to 3, wherein the outer cylinder is integrally formed on the front portion of the first firing member.

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